A macro lens is a lens that has a reproduction ratio of greater than 1:1. It more often then not refers to a lens with a large reproduction ratio even though they rarely exceed 1:1.

A tube be it macro or whatever it is called basically extends the lens focal length by a factor of its multiplier.

I am partial to just using a straight lens when I do macro work. I have used extension tubes but mostly when shooting wildlife. For most of my macro type photography you will see me putting on fixed focal length lenses.

A macro lens is specifically designed for macro photos, while the extension just attaches on to whatever lens you're already using, and is still limited by the performance of the actual lens. It's basically like a magnifying glass or something that screws on to the end of your lens.

Extension tubes allow for closer focusing and larger reproduction ratio, do not get these confused with close up filters as Ben appears to have done in the previous post, extension tubes fit between the lens and camera body and they do not have any optics and therefore do not alter or degrade the optical quality of the lens used , close up filters are just as Ben said and screw onto the front of your lens like a filter and are really a big waste of time.
A macro lens is really just a lens with an extension tube built in. I much prefer extension tubes than macro lenses because I can use it with any lens I like and they are far cheaper than buying a macro lens.

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It is significant to note that even though a camera has a very short focus range, it might not be a real macro lens. A lens created Online Essay Help especially for macro photography usually has specific features that make it diverse than other general-purpose cameras.

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